*{
    margin: 0;
    padding: 0;
}
#stuInfo_tab tr th{
    width: 150px;
}
#stuInfo_tab tr:nth-child(1){
    height: 40px;
}
#stuInfo_add{
    float: left;
    margin-left: 50px;
    text-decoration: none;
}
#stuInfo_addClass{
    float: left;
    margin-left: 50px;
    text-decoration: none;
}
#stuInfo_select{
    clear: left;
    float: right;
    margin-right: 50px;
}
#stuInfo_query{
    width: 100px;
    text-align: center;
}
#addStudentInfoFrm h3, h3{
    margin: 5% 0 10px 43%;
}
#stuInfo_tab{
    margin:0 13%;
    text-align: center;
}
/*灰色遮罩层*/
.fade{
    display: none;
    width:100%;
    height:100%;
    background:rgba(0, 0, 0, 0.5);
    position: fixed;
    left: 0;
    top: 0;
    z-index: 99;
}

/*弹出层*/
.succ-pop-addStudentInfo, .succ-pop-alterStudentInfo{
    display: none;
    width: 500px;
    height: 400px;
    background: #fff;
    position: fixed;
    left: 8%;
    top: 30%;
    margin-left: -200px;
    margin-top: -150px;
    z-index: 999;
    border-radius: 5px;
}
.succ-pop-addStudentInfo{
    margin-left: 25%;
}
#addStudentInfoFrm{
    margin: 10% 0;
}
#addStudentInfoTab, #alterStudentInfoTab{
    margin-left: 9%;
}
#addStudentInfoTab tr td:first-child{
    width: 100px;
    height: 25px;
    text-align: center;
}
#addStudentInfoTab tr td:nth-child(2) input[type="text"], #selectClass{
    width: 300px;
    height: 25px;
    text-align: center;
}
.addStudent_sex{
    margin-left: 30%;
}
input[type="radio"]{
    margin-left: 15px;
}
.btn_instance{
    margin: 0 15px;
    width: 50px;
    height: 25px;
}
#addStudentInfoTab tr:last-child{
    height: 40px;
}


.succ-pop-addClassInfo{
    display: none;
    width: 350px;
    height: 250px;
    background: #fff;
    position: fixed;
    left: 50%;
    top: 30%;
    margin-left: -200px;
    margin-top: -150px;
    z-index: 999;
    border-radius: 5px;
}
#addClassInfoFrm h3{
    margin: 5% 0 10px 35%;
}
#addClassInfoFrm{
    margin: 10% 0;
}
#addClassInfoTab{
    margin-left: 15%;
    text-align: center;
}

#addClassInfoTab tr:first-child{
    height: 25px;
    text-align: center;
}

#addClassInfoTab tr:last-child{
    height: 40px;
}
#addClassInfoTab tr td:nth-child(2) input{
    height: 25px;
    text-align: center;
}
.instance{
    margin: 0 10px;
    width: 50px;
    height: 25px;
}

.succ-pop-alterStudentInfo{
    margin-left: 25%;
}
#alterStudentInfoTab tr td:first-child{
    width: 100px;
    height: 25px;
    text-align: center;
}
#alterStudentInfoTab tr td:nth-child(2) input[type="text"], #selectClass{
    width: 300px;
    height: 25px;
    text-align: center;
}
.addStudent_sex{
    margin-left: 30%;
}
input[type="radio"]{
    margin-left: 15px;
}